[Q] Cannot boot into system

While I can boot into recovery or download, every time I try to boot into system, the phone stuck at bootlogo. I tried flashing different versions of stock firmware, with no luck. I tried flashing CM11, with no luck either. I even tried flashing service firmware, but my phone still cannot boot into system. And yes, I applied param and wiped data/cache after flashing, and this didn't help. Any idea what I can do now?

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